Iron-porcelain insulating-support.



R. P. 1AC'KSON. IRON PORCELAIN INSULATING SUPPORT.

APPLICATION FILED FEB. 19, I914.

PatentedSept. 26, 1916. 1

WITNESSES INVENTOR ATTORNEY ,ductor and the ground.

I absent.

- UNITED STARS PATENT GFFXCEQ RAY P. JACKSON. OF EDGEWOOD, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

IRON-PORCELAIN INSULATING-SUPPORT.

Application filed February 19, 1914.

1/ 'o all whom it may comern lie it known that I, lixi l. lxcnsox, a citizen of the United States, and a resident oi. Edgewood, in the county of Allegheny ing bodies or structures and particularly to such bodies or structures as are employed for supporting high-voltage lines, conduc tors or devices, and it has special reference to insulating supports which are adapted for outdoor installation and exposure to severe mechanical and electrical service conditions.

Heretofore, insulating supports have usually been made of porcelain ha ving corrugated surfaces or other structural characteristics to provide very long leakage paths between the (IOHdllClLOI'S or devices and the ground in order to avoid surface discharges. Because such porcelain supports were exposed, they were of a cumhersi'm'ie construction to provide suilirient strength to resist the mechanical strains imposed upon them. By means of my invention, an insulating support is provided which possesses uali ties adapting it particularly tor use in places where mechanical strength is a requisite.

Furthermore, my insulating support may he utilized to insulate very high-voltage conductors and, at the same time, be materially reduced in size and simplified in construciion.

As disclosed in patent appl cation Serial No. 558,744, assigned to the viesting 'house Electric and l\ Ianufacturing Company, it is highly desirable to shape the insulating bod} ot' a conductor support to conform to the normal lines oti'orce which represent the existing electrostatic field between the con By reason oi this special surface configuration, the insulating body is capable of withstanding tl-ie iull voltage 'which the same path through air would withstand it the insulating; body were Since'tl a air is thus utilized to its full value HS'Hli insulator, the insulating Specification of Letters Patent. itatented Sept. 26, 1916.

Serial No. 819,823.

proximately to the electrostatic flow lines and, therefore, ii. so desired, for uniformity oi parts. the insulating surface may intercept some or these iiow lines.

Another advantage accruing from the use of my invention is that the insulating suriaces are protected from deposits of dust and other extraneous matter which tend to lower the resistance of the leakage paths to the ground.

My invention is illustrated in the single figure of the accompanying drawing which is a view, partially in elevation and partially in section, oi an insulating, support constructed in accordance therewith.

An upper and outer member 1, preferably made oi metal, such as cast iron, and havin a downwardly and outwardly flared portion or petticoat 2, is provided with a top extension 3 having screw holes t-therein, by means oi which a clamp or other retainin; means (not shown) tor a high voltage conductor or line. may be secured. l)isposed within and heneatl the member 1, and insulated thereirom by a porcelain ele ment 5, is a second member (5 that is provided with a corresponding pettieoat 7 and an elongated upwardly extending portion 8. The porcelain element 5 extends urnvardly into the upper portion oi the member 1, and

is provided with recesses 9 formed in the inner and outer surfaces oi its upper and lower portions, substantially as shown. The upper portion 8 of the member (5 projects into the interior oi upper portion of the porcelain element (lenient or binding material 10 is interposed between the element 5 and the two conducting members i and ii in order to hold them in fixed relation, and to insure rigidity to the insulating support. interposed between the petticoat 2 and the petticoat T is a body 11 of material having high dielectric properties and molded to provide a leakage surface which coni'orms to the dir :tion of the electrost tic. ilow lines between the conducting memhers l and ('3. To preclude the detcrioration oi the molded material ll and to provide. a high-resistance leakage path, an annular porcelain member 12 of inverted frusto-conical shape, is placed intermediate the petticoats 2 and 7. The member 12 is shaped to coincide substantially with the electrostatic iiow lines, as above mentioned.

It will be understood that this requirement is not essential and, for low voltages, not necessary, but, in a high-voltage installation, it is desirable to provide the member 12 with surfaces which will conform substantially to the electric-lines of force established between the conducting members 1 and 6. I

At present, it is impossible to manufacture a suitable molding material 11 which,

will not deteriorate when exposed to severe weather-conditions, In time, the exposed surfaces of these molding materials become honeycombed and filled with particles of dust and other matter which decrease the insulating properties thereof. As a result,

the resistance of the leakage path between the petticoats 2 and 7 will be decreased .unless the porcelain member 12, or other suitable means, is utilized to protect the exposed surface of the molded material 11.. Again, porcelain material may be readily molded into various shapes before being glazed.

This particularly adapts porcelain. for use where the exposed insulating surface must conform to the electrostatic flow lines, as mentioned above.

From the drawing, it will be seen that a plurality of conducting members 6, one in sulated from the other by means of the nested insulating elements 5, are provided for each support, the total number of'-'-'conducting members depending upon the service conditions to which the insulating support will be subjected.v Sapacesl are left unoccupied by so positioning barriers ll as to preclude the flowing of cement 10 or molded material 11 therein. This does not effect the insulating properties of my device and considerably lightens the assembled structure.

Inasmuch as the conducting members I and G are adequately insulated from one another, and the member 12 is interposed therebetween to provide a permanent leakage path of high resistance, the insulating structure is able to withstand such stresses as may be imposed thereupon by service conditions. The insulating elements 5 are interposed between the members 1 and 6, and are exposed only to compressive stresses which porcelain is particularly adapted to Withstand.

The petticoats 2 and 7 shield the surfaces of the member 12 from rain and other matter which would lessen the resistance of the leakagepath provided thereby, and, at the same time, also protect said member from A mechanical. blows or impacts which might result from the dropping of tools upon the supporter the falling of masses of sleet and ice from the conductor which is secured to the extension 3.

My invention is, of course, not restricted to any particular applicatiom'and I desire that its scope shall be limited only by the appended claims. I

I claim as my invention: 1. An insulating support comprising a plurality of superposed and spaced 'conducting members nested one Within another,

said conducting members provided with elongated upper portions and conically flared lower portions, insulating members inter-posed between adjacent con-ducting mem bers to resist compressive stresses, and porcelain members bridging the spaces between adjacent flared portions of the conducting members in order to provide leakage paths of permanently high resistance.

An insulating support comprising a plurality of superposed and spaced conducting members nested one within another,

insulating members interposed between adjacent conducting members in order to resist electrical andmechamcal stresses existing therebetween and )orcelam members disposed in the leakage paths between said adjacent conducting members.

3. An insulating support comprising a plurality of superposed and spaced conducting members provided with conically flared lower portions, means for insulating adjacent conducting'members from each other,

conform to the lines of force representing T the electric held between said conducting members. i

In testimony whereof, I have hereunto subscribed my name this 16th day of Felt,

RAY P. JACKSON.

lVitnesses Gowns E. McGee, ll. 1). I-IINES. 

